Air bubbles in sand...

[Flaxon-Waxon]

I see these under the sand line through the glass of the tank, like little air pockets. Lately it's pretty bad. I'm always seeing them "release" and see bubbles floating to the top... What causes this? And could it be why my soft corals (zoas, palys) be closed?

 

[nelix10]

Sounds like a healthy deep sand bed!

 

[czwicky]

Not nescerally. It could be pockets of I think its hydrogen sulfide. A toxic gas that builds up in sandbeds that are never agitated. But if you've never stirred your sand don't start or you will crash you tank

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